Wherever you look, remember that our seats use the front tongue and rear thumbscrew tab and not the flip-up bracket that a lot of production FXR's used.
yes, they do use the front tongue. HOWEVER the FXR4, and I think all the others too, have the hardware welded onto the frames for the flip-up seats. You can buy the hinge hdw from HD, I have the part numbers somewhere if somebody needs/wants them.
The cost is about $120 ........... I have the hardware. I tried out a Mustang Solo saddle on my FXR4. In order to put that saddle on the bike you have to have the hinge hardware. I've since returned that Mustang saddle and have the Corbin on the bike FOREVER !!
If anyone is interested by the way, in the hardware I'll sell it at a nice discount, PM me if you're interested.
Mikey